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Goodwill and intangible assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and intangible assets | Goodwill and intangible assets:
Goodwill |  |  |  |  |  |  |  |
Balance at December 31, 2018 |  | $ | 137,190 |  |  |  |  |  |  |
Addition from acquisition of Atlantic Capital branches |  | 31,961 |  |  |  |  |  |  |
Relief of goodwill due to sale of TPO mortgage delivery channel |  | (100) |  |  |  |  |  |  |
Balance at December 31, 2019 |  | $ | 169,051 |  |  |  |  |  |  |
Balance at December 31, 2019 |  | $ | 169,051 |  |  |  |  |  |  |
Addition from acquisition of Farmers National |  | 6,319 |  |  |  |  |  |  |
Addition from acquisition of Franklin |  | 67,191 |  |  |  |  |  |  |
Balance at December 31, 2020 |  | $ | 242,561 |  |  |  |  |  |  |
Goodwill is tested annually, or more often if circumstances warrant, for impairment. Impairment exists when a reporting unit's carrying value exceeds its fair value. As of December 31, 2020, the Company performed a quantitative assessment and determined it was more likely than not that the fair value of the reporting units exceeded its carrying value, including goodwill. As such, no impairment was indicated. The Company performed a qualitative test of goodwill for impairment as of December 31, 2019 and determined there to be no impairment. The Company recorded $100 in relief of goodwill during the year ended December 31, 2019, related to the sale of the TPO mortgage delivery channel. See Note 2, "Mergers & Acquisitions" for information on the calculation of goodwill for each of our mergers and acquisitions. Core deposit and other intangibles include core deposit intangibles, customer base trust intangible and manufactured housing servicing intangible. The composition of core deposit and other intangibles as of December 31, 2020 and December 31, 2019 is as follows:
|  | Core deposit and other intangibles |  |
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |
December 31, 2020 |  |  |  |  |  |  |  |
Core deposit intangible |  | $ | 59,835 |  |  | $ | (38,807) |  |  | $ | 21,028 |  |  |
Customer base trust intangible |  | 1,600 |  |  | (547) |  |  | 1,053 |  |  |
Manufactured housing servicing intangible |  | 1,088 |  |  | (743) |  |  | 345 |  |  |
Total core deposit and other intangibles |  | $ | 62,523 |  |  | $ | (40,097) |  |  | $ | 22,426 |  |  |
December 31, 2019 |  |  |  |  |  |  |  |
Core deposit intangible |  | $ | 49,675 |  |  | $ | (33,861) |  |  | $ | 15,814 |  |  |
Customer base trust intangible |  | 1,600 |  |  | (387) |  |  | 1,213 |  |  |
Manufactured housing servicing intangible |  | 1,088 |  |  | (526) |  |  | 562 |  |  |
Total core deposit and other intangibles |  | $ | 52,363 |  |  | $ | (34,774) |  |  | $ | 17,589 |  |  |
During the first quarter of 2020, the Company recorded $2,490 of core deposit intangibles resulting from the Farmers National acquisition, which is being amortized over a weighted average life of approximately 4 years. During the third quarter of 2020, the Company recorded $7,670 of core deposit intangibles resulting from the Franklin merger, which is being amortized over a weighted average life of approximately 4 years. The estimated aggregate future amortization expense of core deposit and other intangibles is as follows:
2021 |  | $ | 5,477 |  |
2022 |  | 4,586 |  |
2023 |  | 3,658 |  |
2024 |  | 2,946 |  |
2025 |  | 2,306 |  |
Thereafter |  | 3,453 |  |
|  | $ | 22,426 |  |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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